( | 450 | + | 250 | + | 400 | ) | ÷ | ( | 280 | + | X | ) | = | 11 5 |
方程两边同时乘以: | ( | 280 | + | X | ) |
( | 450 | + | 250 | + | 400 | ) | = | 11 5 | ( | 280 | + | X | ) |
450 | + | 250 | + | 400 | = | 11 5 | ( | 280 | + | X | ) |
450 | + | 250 | + | 400 | = | 11 5 | × | 280 | + | 11 5 | X |
450 | + | 250 | + | 400 | = | 616 | + | 11 5 | X |
1100 | = | 616 | + | 11 5 | X |
- | 11 5 | X | = | 616 | − | 1100 |
- | 11 5 | X | = | - | 484 |
484 | = | 11 5 | X |
11 5 | X | = | 484 |
X | = | 484 | ÷ | 11 5 |
= | 484 | × | 5 11 |
= | 44 | × | 5 |
X | = | 220 |